/*****************************************************************************
 * Author:   Valient Gough <vgough@pobox.com>
 *
 *****************************************************************************
 * Copyright (c) 2003, Valient Gough
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.  
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _Mutex_incl_
#define _Mutex_incl_

#include <pthread.h>

namespace rel
{

    class Lock
    {
    public:
	Lock( pthread_mutex_t &mutex );
	~Lock();

	// leave the lock as it is.  When the Lock wrapper is destroyed, it
	// will do nothing with the pthread mutex.
	void leave();

    private:
	Lock(const Lock &src); // not allowed
	Lock &operator = (const Lock &src); // not allowed

	pthread_mutex_t *_mutex;
    };

    inline Lock::Lock( pthread_mutex_t &mutex )
	 : _mutex( &mutex )
    {
	pthread_mutex_lock( _mutex );
    }

    inline Lock::~Lock( )
    {
	if(_mutex)
	    pthread_mutex_unlock( _mutex );
    }

    inline void Lock::leave()
    {
	_mutex = 0;
    }
}

#endif

